Stator winding machine means



April 21, 1964 P. B. GREENE STATOR WINDING MACHINE MEANS 8 Sheets-Sheet 1 Original Filed Feb. 29, 1960 INVENTOR. PAUL B. GREENE I v v I I: HIS ATTORNEY April 21, 1964 Original Filed Feb. 29, 1960 P. B. GREENE STATOR WINDING MACHINE MEANS 8 Sheets-Sheet 2 YMM HIS ATTORNEY April 21, 1964 P. B. GREENE STATOR WINDING MACHINE MEANS Original Filed Feb. 29, 1960 8 Sheets-Sheet 3 JNVENTOR. v FAuL 5.6REENE m5 ATTORNEY April 21, 1964 P. B. GREENE 3,129,499

STATOR WINDING MACHINE MEANS Original Filed Feb. 29, 1960 8 Sheets-Sheet 4 P'v 4 ]NVENTOR.' k, PAUL B.REENE ms ATTORNEIY April 21, 1964 P. B. GREENE I STATOR WINDING MACHINE MEANS Original Filed Feb. 29, 1960 8 Sheets-Sheet 5 .PSOFSV 1015 PAUL BGREENE llll w ll w a m wm Q I \R R6 *N 8Q ME ms ATTORNEY April 21, 1964 P. B. GREENE STATOR WINDING MACHINE MEANS 8 Sheets-Sheet 6 Original Filed Feb. 29, 1960 KA v elm x\\\\ INVENTOR PAUL B. GREENE Hi5 ATTORNEY April 21, 1964 P. B. GREENE STATOR WINDING MACHINE MEANS Original Filed Feb. 29, 1960 8 Sheets-Sheet 7 INVENTOR PAUL B. GREENE ill...

HIS ATTORNEY United States Patent Claims. (31. 29-205 This invention relates to the manufacture of dynamoelectric machines or any other device having a slotted structure relative to which conducting material is fitted as coils formed and insulated relative thereto, and particularly, to a stator winding machine means adapted for accurately winding and/or insulating conducting material as coils relative to a slotted structure.

This is a divisional application of a co-pending application S. N. 11,654 filed February 29, 1960.

An object of this invention is to provide a new and improved stator coil winding machine means adapted to operate efliciently in placement of material relative to stator slots filled automatically and progressively for mass production purposes.

Another object of this invention is to provide a stator winding machine means having mechanism for feeding slot closure means, pegging and the like into a machinewound stator immediately in conjunction with winding of Wire coils into predetermined groups at least a portion of which are temporarily engaged to avoid shifting thereof during insertion and closing of the slots.

Another object of this invention is to provide a stator winding machine means having mechanism to feed insulating material in a continuous strip of paper and the like severable into slot-closing peg portions which are automatically forwarded in pairs by cam-controlled insertion means in steps including winding of a coil into a pair of stator slots positioned adjacent to a Winding head portion having a gear-driven chain therewith also gear-connected directly to a centrally journalled snorkel member through which coil wire is fed and guided to stator slots also by shoe means held to the winding head portion only by said geared snorkel member as well as adapted to be positioned adjustably and longitudinally relative to the winding head portion, then a rod-like hooked-end woodpecker means being operated to hold end turns of the wound wire coil against shifting relative to slot liners of insulating material which is generally channel shaped and optionally dislocated laterally such that U-shaped slotclosure peg portions are forced longitudinally into slots with one side thereof between the slot liner and slot periphery and with an opposite side thereof between the wound wire coil and an inner periphery of a slot liner, pairs of slots having angular relation to each other while the camcontrolled insertion means operate reciprocally for effecting placement of peg portions each subjected to a predetermined twist just prior to forcing thereof relative to the pairs of slots and also into angular relation to each other in the slots instantaneously during operation of slot closure mechanism.

A further object of this invention is to provide a stator winding machine means having a winding head portion on which a plurality of gear means are journalled together and rotatable in accordance with movement of a continuous sprocket-driven chain radially inwardly from which a snorkel member with a laterally enlarged axial passage is journalled in geared relation to the chain having an eyelet for guiding coil wire relative to a shoe means supported by the geared snorkel journalled for rotation and positive geared connection simultaneously with movement of the chain in either of reverse directions, the geared snorkel member serving to avoid binding and hindrance 3,129,499 Patented Apr. 21, 1964 in machine winding due to reduction of friction and reaction force against proper following of the snorkel member relative to movement of the chain in a loop path having greater lengths than width.

Another object of this invention is to provide a stator winding machine means having a mechanism to feed insulating material in a continuous strip of insulating material such as paper, plastic-like ribbon and the like severable into slot-closing peg portions, coil separators and the like to be fitted longitudinally in slots and which are formed to conform generally in shape to U-shaped channels, grooves and the like in alignment with blade, like mandrel means resiliently backed by spring means with respect to a head having the channels therein substantially parallel to each other and complementary to the mandrel means which are protected against damage by the spring means.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein preferred embodiments of the present invention are clearly shown.

In the drawings:

FIGURE 1 is a front, elevational view of a portion of stator Winding means in accordance with the present invention.

FIGURE 2 is a detail plan view of portions of mechanism for feeding slot closure means, pegging and the like into a machine-wound stator in conjunction with winding of wire coils.

FIGURE 3 is a side elevational view of mechanism of FIGURE 2.

FIGURE 4 is a top view of mechanism in FIGURE 2 taken in the direction of arrow 4 in FIGURE 3.

FIGURE 5 is a cross-sectioned, elevational view taken along line 5-5 in FIGURE 3.

FIGURE 6 is a cross-sectioned view taken along line 6-6 in FIGURE 5.

FIGURE 7 is a cross-sectioned view taken along line 7-7 in FIGURE 5.

FIGURE 8 is a fragmentary perspective view to show stator slot filling accomplished with the machanism of FIGURES 17.

FIGURE 9 is a cross-sectioned, elevational view similar to that of FIGURE 5 though showing formation of slot closure means, peggingand the like by a portion of mechanism on a stator Winding machine means in accordance with the present invention.

FIGURE 10 is a fragmentary, cross-sectional view of stator winding machine means including a winding head portion that carries a continuous sprocket-driven chain having an eyelet that receives coil wire from a centrally journalled snorkel member that is in geared relation with the sprocket-driven chain and that is elongated for attachment of wire guiding shoe directly to one end thereof.

FIGURE 11 is a view taken along line 1111 in FIG- URE 10.

FIGURE 12 is a plan view taken in the direction of arrow 12 in FIGURE 10.

FIGURE 13 is a fragmentary sectional view taken longitudinally through the snorkel member in FIGURE 10 and relative to a slotted stator structure.

FIGURE 14 is a plan view of an articulated end portion of wire guide shoe means provided for the stator winding machine means in accordance with the present invention.

FIGURE 15 is an end view taken in the direction of arrow 15 in FIGURE 14.

FIGURE 16 is a diagram to illustrate sequence of operation of mechanism for feeding slot closure means, pegging and the like in accordance with the present in.- vention.

Dynamoelectric machines generally include a stator having a central annular bore and slots adjacent thereto located angularly relative to each other and radially such that coil wire, insulation separators and slot closing pegs are fitted thereto with considerable time and labor required. The stator winding machine means of this invention facilitates dynamoelectric machine stator component assembly on a mass production basis.

In FIGURE 1, there is illustrated a front elevational view of a portion of stator winding means of the present invention including a base or support portion generally indicated by numeral 49 as well as a winding head portion generally indicated by numeral 42. The base 40 includes a portion 44 and plate 45 which rotatably supports a stator lamination assembly generally indicated by numeral 47 having radial slots 47s therein and a central opening or apertures 47a through which the winding head portion 42 projects. Further details and description as to structural relationship and operation of the winding head portion 42 relative to the support or base 49 and components thereof can be obtained by reference to U.S. Patent 2,988,29lGreene et al. issued June 13, 1961, for a stator coil winding machine and belonging to the assignee of the present invention. Modifications and improvements for the previously disclosed machine are set forth herein in accordance with the present invention.

Shown on the stator winding machine means in FIG- URE 1, there is a mechanism generally indicated by numeral 50 for feeding slot closure means, pegging and the like into a machine wound stator immediately in conjunction with winding of wire coils into predetermined groups. The mechanism 59 includes a pair of reels or storage means indicated individually by reference numeral 51 and rotatably journalled relative to a shaft 52 or other suitable bearing means carried by an auxiliary yoke or support portion 53 having a pair of laterally outwardly extending projections 53p and mounted relative to the base 4% by any suitable means such as bolts or other fastening means not illustrated. Plural coils of insulating material 511' in the form of a continuously wound strip of insulation or plastic treated paper and the like indicated by reference numeral 51s can be supplied from the reels 51 to a roller-cutting portion of the mechanism 50 visible in greater detail in views of FIGURES 2, 3, 4, 5, and 9. This roller-cutter portion includes a plurality of rollers including outer guide rollers 54 journalled by a shaft or pins 54p relative to a bracket or support mews 54!) extending in opposite directions laterally away from a pair of inner rollers 55 rotatably journalled about shafts or pins 55p located to extend horizontally in a position adjustable vertically as determined by turning knurled members 55k relative to side plates 55s reciprocable in up and down directions relative to a guide or slot 54g formed in part by each of the brackets 54b and a cover portion 54c that serves as a limit or stop governing degree of vertical movement possible. As best visible in FIGURE 3, the rollers 55 are positively connected by way of pins 55p to a toothed gear 551 which meshes with toothed gear means 56! secured to a shaft or pivot 56p relative to lower feed roller means 56 visible in FIGURE 3 and outlined in FIGURES 1 and 2 A bell crank means 57 including a laterally extending arm portion 57a is adapted to transmit a predetermined rotative force for movement to effect progressive feeding of the strip of insulating material Slls on each side in increments between rollers. A pair of coil springs 57s normally bias the bell crank means 57 downwardly such that the lateral arm 57a rests against adjustable projections 57p. One end of the springs 57s is hooked into engagement with a pin or dowel-like hook 57h extending from each of the arms 57a and an opposite end of the springs is hooked around an eyelet 57e anchored to a bracket body extension 54e visible in views of FIGURES 1, 2, and 3. Suitable fastening means 57 such as bolts provide an articulated linkage or pivotal connection between the lateral arms 57a and a pair of projections 53p integral with and movable reciprocably in to and fro directions traversed by a cross piece 58 in a path coinciding generally with that of a slot insertion carrier means indicated generally by numeral 6%. The slot insertion carrier means 60 includes a head 62 mounted transversely relative to a support member 62m. The cross piece 58 is secured and carried by the movable support member 62m. Thus reciprocable movement of the support member 62m coincides with movement of the cross piece 58 and projections 58p for conversion of linear movement thereof into limited rotary movement as effected by the bell crank means 57 relative to the rollers 56 and 55. A suitable backlash control indicated by numeral 59 can be added adjacent to the bell crank 57 as indicated in views of FIGURES 3 and 4. The vertical to and fro movement of the support member 62m is governed by a mechanical control including a rear cam 620 that provides a path 62p for a roller, follower pin and the like similar to roller R visible in another cam path illustrated in FIGURE 2 of the drawings. The cam 62 c includes a central hub portion splined or keyed to a shaft 89. This shaft 89 is preferably the same as that identified by the same reference numeral in the disclosure of US. Patent 2,988,291 mentioned earlier. Power for driving this shaft 89 is supplied and transmitted in a manner similar to that noted in the above US. patent and thus no further description thereof is deemed necessary here.

The reciprocal movement of the support member 62m as effected by the cam 620 on shaft 89 is useful not only for the purpose of feeding strips of insulating paper such as 51s but also for cutting or severing a predetermined length of this insulating strip after an end thereof has been fed between rollers and 56. Cutting or severing of a predetermined length of the strip of insulating material 51s is accompanied by downward or return movement of the support member 62112 such that a pair of lateral, opposite corners 620 of the head 62 of slot insertion carrier means 60 dove-tails such that the corner 62c telescopes relative to a socket means 40s stationary and fixed relative to the base or support means 40. The socket means 40s provides a cavity 40c into which the corners 620 of head 62 retract relative to a lateral body portion 40b integral or carried by the base or support 40. Cutting or severing of the strip of insulating material 51s occurs simultaneouly on opposite sides as best illustrated in FIGURE 5. The corners 62c slideably engage an edge tile of the socket 40s thereby removing a predetermined portion 51p of the strip of material on each side. Nearly simultaneously with the cutting or severing of the predetermined length 51p of the strip of insulating material, there is a bending of this predetermined portion 51p into a channel-shape due to forming of the predetermined portion over a bladelike mandrel means or projection 64 mounted relative to the socket portion 40s and having an upper end protruding to be complementary relative to slots 65 provided laterally inwardly from the corner 62c in the lower periphery of the head 62. The slots 65 extend longitudinally relative to the head 62 such that the predetermined length or portion 51p of the insulating strip is forced in a C-shaped channel portion 650 of the slots 65 wherein the strip material becomes lodged and anchored against abutting shoulders 65a which prevent removal of the strip material from the channel portion 65c except by shifting of the strip or sliding thereof longitudinally out of one end of the channel portion 65c. It is to be understood that a free end 64Ie of the mandrel means effects wedging of a strip material portion 51p relative to each channel portion 650. A plurality of spring means including inner springs 64x con centric with respect to outer spring members 64y all grouped longitudinally in a recess or cavity 642 can be located immediately below each mandrel means 64 as shown in FIGURES 5 and 9. These spring means can total five pairs of concentric springs and members on each side so as to provide strong but resilient backing for each mandrel means so as to avoid damage thereto or to head portions in the event any jam up occurs as to insulation portions 51p. The machine is thus protected to avoid breaking of die heads if insulating material should get stuck.

It is to be understood that the head 62 is movable back and forth in a reciprocal path substantially transverse to the support member 62m as governed by a guide portion 62g along an upper end of the support member 62m and adapted to cooperate with a dove-tailing downwardly extending portion 62d of the head 62 secured by fastening means or bolts 62x to portions 62d made separable to facilitate servicing or repair of parts as represented in FIGURES 5 and 9. A pinion or externally toothed gear 66 secured or keyed to a shaft 67 journalled adjacent to or below the guide 62g of the support member 62m is provided together with a somewhat larger gear end 68 as best seen in FIGURE 5. The pinion 66 is adapted to be rotatably moved inside a cavity 660 visible in FIGURES 5 and 6. The pinion 66 has external teeth that mesh with teeth 692 of a bar or rack 69 visible or outlined in FIG- URES 3 and 6.

The pinion passes along the teeth 69t of the rack 69 simultaneously as the rack is moved reciprocally in accordance with movement of a support member 69m best seen in FIGURE 3. The support member 69m has an extension 69e relative to which a pivotal means or pin 69p is mounted for journalling the roller R noted earlier with reference to FIGURE 2. The roller R follows a path or guide 69g provided along a periphery or side of a cam 69c visible in both FIGURES 2 and 3 and having a hub portion 69h keyed to splines 89s of shaft 89. Also visible in FIGURE 3, is a roller 62; that follows the cam path 62p mentioned earlier as provided for purposes of to and fro reciprocal movement of the support member 62m. The cam 69c can be referred to as located in front of the rear cam 62c and the shaft 89 is suitably journalled by hearing means 8% relative to an extension 892 integral with the base or support generally indicated by numeral 40. The head 62 also includes a rack portion 62r visible in FIGURES 3 and 7 such that the head 62 is reciprocally movable along guide 62g in to and fro directions substantially transverse to reciprocal movement of the rack 69 relative to pinion 66. Rotation of the pinion 66 as well as externally-toothed gear 68 which is in mesh with the rack 62r of the head 62 effects movement of the head 62 closer to or away from the stator lamination assembly 47 noted earlier. This stator lamination assembly is shown also in FIGURES 3 and 7.

Actuator means generally indicated by numeral 70 are provided on one side of the head 62 in a location opposite to that Where the stator lamination 47 is supported. The actuator means includes a mounting bracket 71 secured by a suitable fastener 71f such as a bolt and the like relative to a conduit member 72 having a hollow cylindrical body abutting thereagainst at one end and indicated by numeral 73. Reciprocable inside the cylindrical member 73 there is a piston 74 having sealing means 75 provided therein in a well-known manner. An end 73e of the cylinder 73 is in sealing engagement with the conduit member 72 such that any suitable medium such as hydraulic fluid, gas under compression and the like can be supplied by way of a passage 72p for effecting shifting of the piston 74 in a direction away from the head 62 and stator assembly 47. Simultaneous operation of a pair of pistons 74 in a pair of cylinders 73 included with the actuator means 70 effects longitudinal movement of inserter means or rods 76 attached at one end to each piston 74 and visible in FIGURES 5 and 7 as well as outlined in FIGURE 3. For thin Mylar insulation or paper-like material insertions, these inserter means 76 can have a coined grip or barb on one end to engage portion 61p and travel in paths substantially parallel to each other longitudinally through the channels 650 in dovetail portions 62d with the head 62 so as to push force and slide a channel-shaped peg coil separator of insulating material or 6 slot-closure means identified by P in FIGURES 7 and 8 longitudinally along these channels to a twist contour provided in each channel adjacent to an end or extension 76s integral with the head 62 as visible in FIGURE 4.

Initially the insulator portions 51p as formed in the channels are maintained parallel to each other; but, since the slots are angularly located rather than parallel, it is necessary to impart a twist from the parallel path immediately before portions 51p enter a pair of slots angularly disposed relative to each other. This twist results from having the last surface area of each channel made progressively more angular rather than purely parallel with respect to the other so that momentarily the insulating material of portion 51p is twisted to conform to angular relation of the pair of slots. The inserter means or rods 76 themselves are not twisted but have slight cutouts along edges adjacent to the ends thereof such that each rod or inserter means 76 can travel the full length of the channels 650. Without any twist with respect to the longitudinal axis of each channel 65c, it would be necessary to have the channels located angularly rather than substantially parallel to each other. Angular relationship of the channels would provide full axial alignment of the channel relative to angularly located slots but would eliminate formation of insulation portions 51p in accordance with the present invention in a single operating mechanism.

There are preferably two of the extensions 762 spaced laterally apart and substantially aligned longitudinally relative to a pair of slots such as 47s but spaced axially therefrom so as to laterally maintain positioning of wound end turns of coil wire wound into the slots to a predetermined width such that insertion of insulator portions 51p as coil separators or slot closure pegs can be efficiently and neatly effected without interference by and drifting or displaced coil wire loop. The twist-contour ends of the channels 65c are directly in alignment longitudinally, annularly and axially relative to these slots 47s in pairs relative to which coil wire 47w has been machine wound with end turn portions 47a of the coil wire projecting laterally to one side of the stator lamination assembly 47. Prior to beginning of the machine winding of coil wire 47w into the slots 47s each of the slots is fitted with a slot liner such as indicated by L and having a generally C- shaped configuration extending longitudinally to form a channel for receiving the coil wire.

The predetermined length for portion 51p of the insulating strip 51s as cut therefrom by the corners 62c sliding relative to edge 4%, permits the end 64a of the mandrel means 64 to form the coil separator, channel-shaped, a slot closure means for peg P and the like relative to chan nel 650 as best seen in the view of FIGURE 9. After formation of the peg or slot closing means during retraction of the head 62 laterally away from the stator assembly 47 as well as downwardly away from head portion 42, the pegs are formed in pairs in the channels 65c ready for realignment with the inserter means 76 as well as slots 47s. It is to be understood that supply of a pressure transmitting medium such as air under pressure, hydraulic fluid and the like through the passage 72p effects retraction of the inserted means 76 laterally to one side of the support member 62m away from the stator assembly 47. A suitable flexible conduit 72c visible in FIGURE 3 is provided to establish communication from a suitable source of pressurized air or fluid medium for passage thereof relative to the conduit plate 72 having passage 72p therein. Another conduit 76R is adapted to establish communication through a suitable passage relative to space with respect to a pressure chamber 760 inside the cylinder 73 of the actuator means such that the piston 74 together with the inserter means 76 can be moved under force transmitted by the fluid pressure medium relative to the inserter means 76 such that a slot closure means for peg P is slideably moved or shifted longitudinally relative to the channel 650 through the extension 76e directly '3' into closing relationship relative to an open end of a slot such as 47s in the stator assembly 47.

It is to be understood that the anti-backlash means 59 can be provided in any suitable form for example, the de vice can comprise a one way clutch whereby the bell crank arm 57a on each side or for each of the pair of slots can effect turning of the feeding rollers 55 and 56 only in one direction so as to effect positive advance of the strip of insulating material 51s. The rollers 54- act only as idlers relative to gear-driven interconnected rollers 55 and 56. Also, it is to be noted that a pin 67 p is inserted transversely through one end of shaft 67 for retention of gear 68 and pinion 66 relative to support member 62m. This relationship of structure is best seen in FIGURE 5.

To assure proper supply of the strip of insulating material Sls, the roller-cutter portion is further provided with a guide plate 49x on each side of the socket member ills as visible in FIGURES 2 and 5. It is further noted that the channel 650 in the head 62 relative to which predetermined lengths of this strip of insulating material are formed by action of the ends 642 of the mandrel means 64 have a generally trapezoidal or keystone-like shape such that the channel forms the predetermined length of material into a substantially U-shaped peg P. The slot closure means for peg P fits relative to the stator assembly 47 as best seen in a fragmentary enlarged view of FIGURE 8. FIGURE 7 shows one of a pair of pegs or projections 76;) extending downwardly from the end '76:: such that coil wire 47w in the end turn portion We is pushed laterally to one side of the inserter means 76 as well as being held laterally against shifting and spreading out of alignment with the head 62. The mechanism 60 can be generally referred to as a feeder that moves in and out laterally as governed by the front in and out cam 69c identified in views of FIGURES 2 and 3 and also referred to in a diagram of FIGURE 16 that illustrates the sequence of operation of mechanism for feeding the slot closure means, pegging and the like in accordance with the present invention. This diagram of FIGURE 16 will be referred to in a summary of operation later in the specification. This diagram also identifies function of the cams 69c and 62c relative to each other and relative to degrees of rotation of the shaft 8% In addition to the projections 76p which engage opposite, outside lateral portions of the end turns 47c of coil wire as indicated in FIGURES 3, 4, and '7 there is provided a rod-like hooked-end Woodpecker means generally indicated by numeral 80 and visible in views of FIGURES 3 and 4. This Woodpecker means includes a rod 81 pivotally secured at one end 81a to a crank 810 which is movable about an arcuate path relative to an axis of a shaft 81s. This shaft 81s is powered by a suitable motor means 81m. The motor means 81m can be electrically powered as well as powered by a fluid medium such as a gaseous medium under compression or even hydraulic fiuid supplied under pressure by way of a tube 8ft as indicated in FIGURE 3. The rod 81 is fulcrumed and is slideable relative to a fulcrum means or eyelet 81 which is pivotally supported by a pin 81p carried by a bracket 81b secured by fastening means such as screws S relative to a joining support plate 81 which serves to position the bracket 81b and motor means 81m in a predetermined relationship to each other. This joining plate 811' is laterally adjustable in position relative to a flange member 31k suitably fastened such as by bolts to the base or support means 4i). The joining plate 81 is adapted to be fixed in a predetermined position relative to slots 811' in a lateral portion of the flange means 81k relative to which suitable fasteners or gripping means such as set screws 81g are provided for fastening of the Woodpecker means 80 in a predetermined position relative to the base or support 40 relative to which the stator assembly 47 is also located in a predetermined position.

The Woodpecker means 89 includes a bifurcated and doubled hooked end portion 84 visible in FIGURES 3 and 4. A pair of hook ends 84h can move vertically as well as laterally in accordance with movement transmitted to one end file by the crank 81c whenever the shaft 81s is caused to rotate a predetermined arcuate distance. For example, one complete rotation of the shaft 315 effects a 360 turning of the crank 81c which is keyed or fastened to an end of the shaft by a set screw and the like. Preferably the end of the shaft 81: terminates substantially flush with the crank 810 such that the end tile held to a radially outer end of the crank 810 by a cotter pin and the like can rotate in repeated cycles in an arcuate path substantially concentric relative to the shaft 81s. Due to the fulcruming provided by the eyelet 3R it is apparent that the rod 81 will cause the end portion 84 and hooks 3412 to traverse a path governed or controlled by the bell crank 81c. Movement of the bell crank 31c in a downward direction effects lowering of the end portion 84 while upward movement results in raising of the end portion 84. Passage of the end 8112 to the right as seen in FIGURE 3 will result in retraction of the end portion 84 from the end turns 47e of coil wire while movement in a leftward direction results in a pivoting inwardly by the end portion 84 relative to the end turns 4% so as to engage as Well as pull the coil wire of the end turn laterally outwardly away from the projection 76p and inserter or feeder means 76 so as to obviate obstruction to passage of the slot closure means or pegs P relative to slots of the stator assembly 47. Operation of the motor means @lm is controlled by a suitable means forming no part of the present invention. A control drum for such a purpose including electric switches actuated periodically during a predetermined cycle operation can be provided as noted in the US. patent referred to earlier. It is to be noted that an advantage of the movement of end 81:: in an arcuate path for fulcruming the rod 81 along a mid portion thereof is utilized particularly because, when the end tlle is near a top portion of its path, the hooked ends 8412 extend substantially parallel to end turns 47c of the coil wire previously wound relative to slots of the stator assembly 47. While the end 81s is in a lower left quadrant as viewed in FIGURE 3, the rod 81 will be substantially vertical in position or substantially parallel laterally relative to the stator assembly 47 such that the hooked ends 8411 positively engage and pull the end turns 4% laterally away from the bifurcated extensions 76a. The Woodpecker means in effect serve as a holding device operative for facilitating insertion of the slot closure means or pegging P relative to the stator assembly 47.

To assure against longitudinal displacement of slot liners L as well as possible tearing or damaging of the insulating material of these liners by coil wire during machine winding, the winding head portion 42 as shown in FIGURE 13 is fitted with two pairs of laterally spaced projecting portions generally indicated by numeral 90. These projecting portions are provided to assure end protection for the slot liners L during machine winding of coil wire 47w relative to slots 47s through the projecting portions $1 are retracted and moved with winding head portion 42 away from the slot liners L during insertion of the coil separators, slot closure means or pegs P relative to partially-filled or fully-filled slots respectively. It is to be understood that the head 62 is indexed into position immediately adjacent to the lamination assembly 47 during slot closure means insertion. However, the head 62 of the feeder mechanism 60 is retracted and located away from the lamination assembly 47 during the actual winding of coil wire into the slots. Upon completion of the winding operation, the winding head 42 is shifted or indexed away from aligned engagement with an inner periphery of the stator assembly 47 such that the projecting portions are no longer located in pairs adjacent to slot liner ends on each of opposite sides of the stator assembly. Fastening means such as screws 90s hold the projecting means 90 relative to a channel-like frame 92 having a laterally inwardly curved pair of end portions 92e which terminate adjacent to slots 92s adapted to be longitudinally aligned with the stator slots 47s. The slots 92s are formed both by the end portions 92e and a central segment 94 of a guide shoe means generally indicated by numeral 96 as visible in FIGURES l and 13. Key means 94k are fitted in dual pairs to this central segment 94 and extend radially into a pair of adjacent slots as indicated in FIGURES and 13 such that the winding head portion 42 is in proper aligned relationship with respect to the stator assembly 47. During maintenance of this proper alignment, the projecting means 90 are so positioned that ends or extensions 90a thereof are located axially adjacent to end portions of the slot liners L ex tending laterally beyond ends of the slots 47s though they need never contact the slot liners directly so as to back or push them. Thus coil wire 47w is machine-wound relative to slots 47s in at least one and usually three layers of coils or groups of coils. Coil separators can be supplied between layers of coils by use of feeder mechanism 60 also. Projecting means 90 hold down previously wound wire during winding of subsequent coils. Projections 76 on head 62 serve a similar purpose during engagement thereof relative to coil end turns. After filling of the slots, the slot closure means or pegs P are ejected from the channel 65c. Optionally, a deflector or rod means 91, diagrammatically shown in FIGURE 8, can be provided to effect limited displacement of one side of a slot liner laterally inwardly as represented such that the slot closure means or peg P straddles the coil wire 47w as well as one side of the slot liner L. A pneumatic or hydraulic actuator 91:; having a piston 91p biased by spring 91r for return to a predetermined position is adapted to actuate rod 91. Rod 91 itself can be resiliently backed by relatively stiff spring 91s provided to avoid damage due to jamming. Thus the one end of the peg P can be fitted inside the slot liner L and an opposite end can be forced outside the slot liner as indicated in FIG- URE 8 due to deflection of one side of the slot liner by rod 91. It is to be noted that this particular method of the insertion of the slot closure means or pegs is used when slot fill or coil wire is such that tight fit of slot closing means can be better obtained by using part thereof to augment slot filling. Generally, however, the slot closure means are fitted wholly inside the slot liners and no additional tightness or locking to assure against looseness thereof is needed.

For guiding and placement of wire relative to the slots 47s, the winding head portion 42 includes a rotatably journalled snorkel member generally indicated by numeral 9S and located centrally inside a chain generally indicated by numeral 100. This chain 100 is power driven in a manner similar to that described in the US. patent referred to earlier. The chain fits peripherally relative to sprockets 101 and 102 as indicated in FIGURES 10 and 11. A secondary chain 104 is provided to drive sprocket 102 by way of intermediate sprockets 105, 106, and 107 visible in FIGURES l0 and 12 and described in greater detail in US. Patent 2,988,291Greene et al. It is to be understood that in place of a direct connection by means of a journalled shaft 105s between sprockets 105 and 102, it is sometimes desirable to divide the shaft 105s into separate parts laterally off-set from each other and provided with a pair of meshing gears for power transmission from the spline shaft 174 identified in FIGURE 10 and referred to in US. patent 2,988,291-Greene et al. Such an intermediate gear connected so as to permit lateral off-setting of portions of the shaft 104s provide increased freedom for movement of the winding head portion 42 relative to a central opening or aperture 47a of the stator assembly 47. Sometimes the base or stationary structure including the portion 45 for mounting of the stator assembly is such that the sprocket 105 is preferably moved laterally to one side away from the location of 10 the stator assembly relative to the winding machine means.

Coil wire 47w is fed through a funnel portion 98 of the snorkel member 98 and into a longitudinally or axially extending passage 98p visible in FIGURES 10, 11 and 13. This passage 98p terminates at its lower end in a laterally and arcuately enlarged opening or end guide portion 982 such that the coil Wire 47w can pass efficiently to an eyelet s having a passage 100p therein which is caused to move in a path longer than it is wide in accordance with movement of the chain 100 relative to the sprockets 101 and 102. This eyelet 1002 passes in a loop periphery around the guide shoe means 96 including a pair of end portions or segments 96e fastened by suitable means such as bolts 96b directly in engagement with opposite ends of the central segment 94 mentioned earlier. The guide shoe means 96 is supported relative to the Winding head portion 42 only by means of a shaft-like portion 98f integral with the snorkel member 98. A retaining ring 98r is press fitted or held to this shaft-like portion 98s by pinning over the end thereof or other suitable fastening means. Suitable roller hearing or ball bearing means are provided relative to the snorkel member 98 both to the intermediate member or segment 94 as well as a mounting bracket 42b adapted to straddle the frame 92 and to provide journalling support for the snorkel member 98 relative to the winding head portion 42. This bracket 42b can be seen in views of FIGURES 10, 12 and 13 and includes multiple slots 42s such that suitable fastening means 42 can be loosened and tightened for adjustably positioning the bracket and snorkel member 98 longitudinally relative to the frame 92 of the winding head portion 42. These fastening means can be in the form of set screws and the like.

In the embodiment of the present invention, the snorkel member 98 is gear driven by means of a power take off connected with the sprocket 101. As best seen in FIG URE 10, the sprocket 101 is secured by a key 101k to a shaft 101s journalled by suitable bearing means relative to the bracket 42b, frame 92 and the like such that an upper end of the shaft 101s has a pinion gear secured thereto by a key 110k and the like. A compound gear 112 is journalled having a main power take off meshing portion 112m engaging the pinion gear 110 such that power is transferred to a smaller and lower gear portion 112s thereof for transmitting driving force to idler gears 113 and 114 journalled as shown in FIGURE 10. The last mentioned idler gear 114 meshes with a sprocket gear portion 98g which is keyed, press fitted or otherwise suitably attached to effect rotation of the snorkel member 98. Due to the gear train connection between sprocket 101 and the snorkel member 98, there is one complete revolution of the snorkel member 98 for every complete revolution of the eyelet 100:2 in the path of the chain 100. Gear connection of the snorkel member 98 provides positive interconnection of the means used to guide and feed the coil wire 47w into the stator slots 47s so far as the winding head portion 42 is concerned. Movement of the chain and snorkel member coincides in either of reverse directions and the geared snorkel member 98 serves to avoid binding and hindrance in machine winding due to reduction of friction of the coil wire relative to the snorkel member 98 and eyelet 100e. There is also an appreciable reduction in the difference in reaction force opposing movement of the coil wire 47w through the passage 98p and extended opening 98e of the snorkel member 98 such that smoother operation is obtained together with more accurate machine winding of the coil wire 47w relative to the slots 47s of the stator assembly. It is to be understood that during the winding operation of the chain and snorkel member, the insulation feeding mechanism is re tracted away from the stator assembly 47. As the head 62 of the mechanism 60 is moved laterally inwardly to a position adjacent to the stator assembly, the head 62 is slightly above the end turns 47e for a sufficient distance to assure clearing thereof during lateral movement.

2 1 Upon reaching a location adjacent to the stator assembly 47, the head 62 together with the extensions 76c are lowered slightly into operative engagement relative to the end turn and adjacent to the stator assembly.

Preferably, during winding of the coil wire into slots 47s, the rate of travel by the geared chain and snorkel member combination is such that a rate of winding anywhere in a range between 100 and 2,000 turns per minute and the like, more and less, can be attained in winding the stator assembly. Over-all high speed operation of the winding machine means is particularly important on stator assemblies having a fewer number of turns of wire in coils. By use of plastic resin insulation coating for the coil wire 47w, it is possible to fill a maximum number of turns into a predetermined slot in a minimum time by using the stator coil winding means in accordance with the present invention. Preferably, upon completion of each coil or group of coils, the eyelet little stops adjacent to a side of the lamination assembly opposite to the side upon which the insulation feeding mechanism is located. As described in US. Patent 2,988,29l-Greene et al., the position for stopping after winding one coil is the starting position for winding of a subsequent coil subject to either long or short indexing movement in an arcuate path.

It is also noted that the control for operation of the main driving motor or source of power for effecting movement of the chain 100 can be electronically as well as mechanically determined. In the event a mechanical gear reduction is used in place of an electronic control, it is preferred that a two-speed gear reduction be provided in a suitable gearbox such that differing rates of operation can be used for running at high speed during a major portion of the winding operation and a slightly lower approach speed can be provided during slow down upon completion of winding for a particular stator coil. Preferably dual clutches and brakes are provided such that with the gearbox the winding can proceed at a relatively high rate of operation without appreciable slow down until within approximately two turns from a stop position whereas with electronic control, it is generally necessary to begin operation at a reduced speed or rate within five and one-half turns away from a final stop position. The machine means in accordance with the present invention can be used to wind coils for two, four and more electrical poles relative to stator assemblies having deep or shallow slots and relative to round as well as square laminations with a minimum of slow down in operation and gain in time at minimum cost of assembly due to speed of operation.

In addition to the geared snorkel member 98 to facilitate placement of coil wire 47w relative to the slots of the stator assembly, the embodiment of the present invention provides an improved pair of end portions or sectors 96a shown in FIGURE and illustrated in individual views in FIGURES l4 and 15. These end portions 962 can be as shown in U.S. Patent 2,988,29l-Greene et al. or can include improved features illustrated in the views of FIG- URES 14 and 15 in which an end portion is identified generally by reference numeral 120. Preferably, this end portion structure 123 includes an upper shell-like means 120m including laterally and longitudinally extending guide sections 126s on opposite sides thereof; the guide sections merge in a nose portion 12hr; at one end and terminate at an opposite end in a cutout 126%: formed as a pocket, recess and the like for retention of grouped end turn coil wire at a location immediately adjacent to and in between the stator structure and guide sections.

t is to be noted that insulation feeding mechanism 60 can be used to insert coil separators as well as slot closure means or even rope-like pegs preformed depending upon the shape of the channels 65c as well as the configuration of the strip of insulating material per se.

FlGURE 16 is a diagram which illustrates the movement of the mechanism 64) including the feeder head 62 and components thereof for in and out movement relative to a stator assembly as well as the up and down movement thereof with respect to the cams 69c and 620. As indicated earlier, the cam 69c governs movement of the feeder or head 62 laterially inwardly toward the stator assembly, and it is to be understood that the cam 69c is inoperative during actual insulation insertion of slot closure means or pegs relative to an open end of slots 47s. Cam 690 also controls laterally outward movement of the feeder or head 62 away from the stator assembly 47. Cam 620 controls the rise of the feeder to a position sub stantially horizontally in alignment with the stator assembly and then while the cam 69b is inoperative, the cam 62c effects lowering or dropping of the feeder or head 62 to a position accurately in alignment with the predetermined pair of slots relative to which the inserter means or rods 76 force the slots closure means or pegs. Suitable electric switches can be provided to operate solenoid valves in the event a gaseous or fluid medium under pressure are provided for movement of pistons inside cylinders as mentioned earlier. Upon completion of the insertion of insulating material into the open ends of the slots, the feeder or head 62 is retracted away from the stator assembly and subsequently the cam 620 permits the feeder or head 62 to drop so as to effect a cut-off of a predetermined length of the insulating. strip together with formation of a peg or channel-like slots closure means relative to the mandrels 64 an indicated previously. The insulating strip of material advances between the rollers 55 and 56 during the up-stroke of the head 62 and the cutting operation occurs during the down-stroke of the head. It is to be noted that opitonally additional insulating strips can be provided in intermediate locations and extending longitudinally through the slots when partially filled with coil wire 47w so as to effect proper filling and separation of certain groups or coil elements from each other when necessary. In such events, it is often customary to insert H-shaped insulating pieces as well as U-shaped pieces and the like and then continue with machine winding of the wire coils in one or more stator winding machines adapted to wind a predetermined number of turns relative to a specific arrangement of coils in a stator assembly. In any event, the insulation feed ing and inserting mechanism 69 in accordance with the present invention, can be used for purposes of closing oif the open end of each of the slots 47s. Improved running and approach control of speed so far as positioning of the winding head 42 is concerned relative to the stator slots can be obtained by using a gearbox together with a pair of clutches and brakes relative to a two-speed transmission as mentioned earlier. Preferably, an insulating coating in a single layer is provided on the coil wire 47w and such insulation is commercially available under a name Mylar. Also, an acrylic (acrylonitrile resin) insulation system can be used wherein wiring can have Dacron insulating fibers thereon. Cotton fiber covering for wiring can also be used. Other suitable commercially available wire insulation coatings such as Formvar, Analac, and polyester resin materials and the like can also be provided on coil wire placed into predetermined slots of a stator assembly by use of stator winding machine means in accordance with the present invention. Where tapped coils are fitted into stator slots by machine windings, the insulation feeding mechanism 60 can insert coil separators in predetermined sequence such that on the first coil wound, separators are inserted on each side of a loop; on the second coil wound, there can be a. separator inserted on one side and a peg or slot closing means on a finished side or where the slot is filled; and on the third coil wound, pegs or slot closing means are inserted on both sides. It is to be understood that insulation inserted by mechanism 60 is identified as a separator or peg depending upon the purpose thereof in the stator. Operation as covered in the specification and claims with respect to mechanism 60 applies both to separators as well as pegs or slot closing means which terms are used inter- 13 changeably herein. The present invention permits machine winding of tapped main and phase windings rather than concentric windings.

While the embodiments of the present invention constitute preferred forms, it is to be understood that other forms might be adopted.

What is claimed is as follows:

1. A stator winding machine means for placement of coil wire and slot closure means relative to a slotted lamination assembly, comprising, a machine base having a portion to support the slotted lamination assembly in predetermined positioning, a winding head portion carried by said base and including a frame means that extends laterally therefrom into a location axially adjacent to the slotted lamination assembly, sprocket means journalled and supported by said frame means, a continuous chain including an eyelet portion to aid in wire distribution and operatively connected for powered movement in a loop path in either of reverse directions due to permanent, positive engagement of said sprocket means with said chain as supported by said frame means, a wirefeeding snorkel member journalled and supported also by said frame means so as to be movable about its own axis in a location centrally relative to said chain, a gear means positively interconnecting said sprocket means and said snorkel member for concurrent powered movement thereof, guide shoe means journalled by said snorkel member and including contoured end portions adapted to fit on opposite sides of the slotted lamination assembly in a location corresponding substantially with path of powered movement of said eyelet portion of said continuous chain for powered placement of wire into predetermined pairs of slots, and an insulation inserting mechanism provided on said base power shiftable into a location longitudinally adjoining said frame means as well as axially on one side of the slotted lamination assembly such that a reciprocal feeder head of the mechanism can be positioned in longitudinal alignment with at least one slot into which slot closure means can be forced from said feeded head by a fluid-actuated shot-like direct axial shift thereof to force said slot closure means into the slot longitudinally to cover coil wire fitted therein.

' 2. A stator winding machine means for placement of coil wire relative to a slotted lamination assembly, comprising, in combination, a machine base having a portion to support the slotted lamination assembly in selectable positioning about an axis of the slotted lamination assembly, a winding head portion carried by said base and including a laterally projecting body to provide frame-like cantilever support which extends axially through the slotted lamination assembly, sprocket means journalled and supported by said body, a continuous chain having an eyelet portion carried thereby for powered movement due to sprocket means engagement of said chain to move in a looped path corresponding substantially with positioning into which wire is distributed to the slotted assembly, said sprocket means at all times having positive driving connection with said chain, a power-take-olf gear connected to a portion of said sprocket means, a snorkel member journalled about an axis thereof and supported by said laterally projecting body centrally to guide wire to said eyelet portion which traverses a powered path corresponding to power actuation of said sprocket means driving said chain that moves for progressively placing wire into a predetermined pair of adjoining stator slots, a gear portion provided on said snorkel member, and a plurality of gears journalled by said body and positively interconnecting said sprocket power-take-oif gear and said snorkel gear portion which effects rotation of said snorkel member proportionally to corresponding chain movement for wire placement in a coil-like loop in predetermined pairs of stator slots.

3. A stator winding machine means for placement of coil wire and slot closure means relative to a slotted lamination assembly, comprising, in combination, a base having a portion to support the slotted lamination assembly in selectable positioning about an axis of the slotted lamination assembly, a winding head portion carried by said base and including a laterally projecting frame-like body extending in cantilever positioning in a location axially of the lamination assembly which readily can be placed as well as removed relative to one end thereof, sprocket means journalled and supported by said body, a continuous chain having an eyelet portion carried thereby in a loop path extending longitudinally through a central opening of the lamination assembly, a Wire feeding snorkel member journalled and supported also by said body so as to be movable about its axis in a location surrounded by said chain, gearing that positively interconnects said sprocket means and said snorkel member for simultaneously powered movement thereof, guide shoe means journalled by said snorkel member and including contoured end portions adapted to fit longitudinally on opposite sides of the slotted lamination assembly in a location corresponding substantially with path of powered movement of said eyelet portion of said continuous chain for powered placement of Wire into predetermined pairs of slots, and an insulation inserting mechanism provided on said base power shiftable into a location longitudinally adjoining said frame means as well as axially on one side of the slotted lamination assembly such that a reciprocal feeder head of the mechanism can be positioned in longitudinal alignment with at least one slot into which coil separators, slot closure means and the like can be forced from said feeder head by a fluid-actuated shot-like direct axial shift thereof to force said coil separators, slot closure means and the like into the slot longitudinally to cover coil wire fitted therein, said feeder head upon retraction from the slotted assembly permitting free access to one end of said winding head portion.

4. The machine means of claim 3 wherein extending from said frame-like body of said winding head portion there are projections on each side thereof that protrude laterally to a location axially adjacent to the slot insulation protected thereby against shifting as well as possible damage such as tearing and the like, due to wire whipping, binding and the like during placement thereof into a predetermined pair of stator slots, said feeder head also having a projection portion laterally to engage coil end-turn wire during slot closure means insertions.

5. The machine means of claim 3 wherein a fluid-actuated rod-like hooked end member pivotally as well as reciprocally mounted relative to said base is provided for engaging coil end turns so as to keep wire thereof spread laterally outwardly and anchored against shifting as well as possible interference during insertion of slot closure means, said frame-like body of the winding head portion having a pair of projections on each side thereof for laterally shielding the slot insulation protected thereby against shifting as well as possible damage such as tearing and the like during placement thereof into a predetermined pair of stator slots, said feeder head also having a projection portion laterally to engage coil end-turn wire simultaneously with spreading engagement of end turns by said hooked end member during slot closure means insertion.

6. A stator winding machine means for placement of coil wire relative to a slotted lamination assembly provided with insulation material slot lining, comprising, a machine base having a portion to support the slotted lamination assembly in indexable locations about an axis of the slotted lamination assembly, a winding head portion carried by said base and including a laterally projecting frame-like body which extends axially through the slotted assembly and which is movable into engagement with the slotted lamination assembly, sprocket means journalled and supported by said body, a continuous chain having an eyelet portion carried thereby for powered movement due to sprocket means engagement of said chain to move in a loop path into positioning con'esponding to that of guidance through which coil wire is fed, said sprocket means having positive driving connection at all times with said chain, a power take-oh gear connected to a portion of said sprocket means, a snorkel member to guide wire to said eyelet portion anywhere in a radially outer direction from said snorkel member which is journalled as well as supported also by said body so as to be movable about a longitudinal axis of said snorkel member in a location surrounded by said chain, a gear portion provided on said snorkel member and at least one gear journalled for rotation relative to said body for interconnecting said power take-off gear and said snorkel gear portion whereby said snorkel member is positively driven at all times to avoid binding and hindrance in machine winding due to reduction of friction and reaction forces against proper following of said snorkel member relative to movement of said chain in a loop path having greater length than width while said snorkel member is rotatable for 360 about its longitudinal axis.

7. The stator winding machine means of claim 6 in which an insulation insertion mechanism is provided on said base power shiftable into a location longitudinally adjoining said frame-like body as well as axially on a side of the slotted lamination assembly such that a reciprocal feeder head of the mechanism can be positioned substantially in longitudinal alignment with at least one slot into which insulating material as coil separators, slot closure means, and the like can be forced by a fluidactuated direct axially shift ramming thereof from said feeder head so as to cover wire fitted therein, said framelike body having a depending pair of winding head projections in a location longitudinally adjacent to ends of slot lining material and adapted to hold down any coil wire already fitted into the slotted assembly so as to assure against any interference with wire winding such as by engagement of wire as well as the eyelet portion relative to previously Wound wire and slot liners.

8. The stator winding machine means of claim 6 in which an actuator including a fluid-actuated reciprocable rod is provided on said base in a location on the side of the slotted lamination assembly such that the rod can deflect one side of the slot lining such that slot closure means can be forced to straddle one side of the lining as well as wire therein.

9. A stator winding machine means for placement of coil wire and slot closure means relative to a slotted lamination assembly, comprising, a machine base having a portion to support the slotted lamination assembly in predetermined angular positioning, a winding head portion carried by said base and including a frame adapted to extend therefrom laterally into a location radially adjacent to the slotted lamination assembly, sprocket means jour nalled and supported by said frame, a continuous chain including an eyelet portion to aid in wire distribution and adapted to be power driven in a loop path in either of reverse directions due to permanent, positive engagement of said sprocket means with said chain, a wire-feeding snorkel member journalled and supported also by said frame means so as to be movable about its own axis in a location centrally relative to said chain, guide shoe means journalled by said snorkel member and including contoured end portions adapted to fit longitudinally on opposite sides of the slotted lamination assembly and forming part of said winding head portion due to interconnec-v tion thereto by said snorkel member, and a positive mechanical-driving connection means engaged at all times between said snorkel member and said power driven chain.

10. On a stator winding machine means for placement of coil wire guided to stator slots by way of a cantileverlike winding head portion journalling power-driven sprocket means and a continuous chain including an eyelet portion which traverses a loop path around both a guide shoe portion thereof as well as a wire-feeding snorkel member journalled centrally thereof, improvement which comprises a positive mechanical-driving connection means engaged at all times between said snorkel member and said power-driven chain to avoid binding and hindrance in machine winding due to reduction of friction and reaction forces against proper following of said snorkel member relative to powered movement of said chain in a loop path having greater length than width while said snorkel member is rotatable for 360 about its longitudinal axis.

References Cited in the file of this patent UNITED STATES PATENTS 

1. A STATOR WINDING MACHINE MEANS FOR PLACEMENT OF COIL WIRE AND SLOT CLOSURE MEANS RELATIVE TO A SLOTTED LAMINATION ASSEMBLY, COMPRISING, A MACHINE BASE HAVING A PORTION TO SUPPORT THE SLOTTED LAMINATION ASSEMBLY IN PREDETERMINED POSITIONING, A WINDING HEAD PORTION CARRIED BY SAID BASE AND INCLUDING A FRAME MEANS THAT EXTENDS LATERALLY THEREFROM INTO A LOCATION AXIALLY ADJACENT TO THE SLOTTED LAMINATION ASSEMBLY, SPROCKET MEANS JOURNALLED AND SUPPORTED BY SAID FRAME MEANS, A CONTINUOUS CHAIN INCLUDING AN EYELET PORTION TO AID IN WIRE DISTRIBUTION AND OPERATIVELY CONNECTED FOR POWERED MOVEMENT IN A LOOP PATH IN EITHER OF REVERSE DIRECTIONS DUE TO PERMANENT, POSITIVE ENGAGEMENT OF SAID SPROCKET MEANS WITH SAID CHAIN AS SUPPORTED BY SAID FRAME MEANS, A WIREFEEDING SNORKEL MEMBER JOURNALLED AND SUPPORTED ALSO BY SAID FRAME MEANS SO AS TO BE MOVABLE ABOUT IT OWN AXIS IN A LOCATION CENTRALLY RELATIVE TO SAID CHAIN, A GEAR MEANS POSITIVELY INTERCONNECTING SAID SPROCKET MEANS AND SAID SNORKEL MEMBER FOR CONCURRENT POWERED MOVEMENT THEREOF, GUIDE SHOE MEANS JOURNALLED BY SAID SNORKEL MEMBER AND INCLUDING CONTOURED END PORTIONS ADAPTED 